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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f5e6eaa659fd13e4567fc85889969efcf2ad881bf828610ef1fb61a2d88da5f' 
  AND token = 'A81bH2jeUFvG8zG1BNyWxPM+5sXx927kepwWDA9vzdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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