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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e66e0bd91923d02d8c5c528b47013390f48a8044f3d17387a080e2c5c6f6b92' 
  AND token = 'jL4EMMNzsvG83E7cA2sY1txydVZqNNqiiVu41paz3gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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