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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e34109a4213d42f4e8be1387f507e5cffbdebb35659870cdc3ba03219b0bdb' 
  AND token = 'PwIEjpo2D2ZtiAaKqLqyTsBkG1q6UqTn4rwO4F9m6jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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