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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90eb80236ecb7f42f5bd82a7eb8758e43ae2e36c5999e609d8d465e8fc4aa700' 
  AND token = 'AUArJjPu55Jt6S2NIIJfRprji8nrIroUJKPTa/3BEJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}