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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c3661e0f25bc2203fb76fc53b08ea4929cfa5fc5d7956504a1524e2c5586cf' 
  AND token = 'ttDQ8LZPGvViSqvLesT2nSGjDdU6XyPRw2l7rh3DYo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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