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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab2cb65949f95e02f12b6020a80d8c67655bae0792b26a185a88a35ec1d02e7' 
  AND token = 'd0Tmb6lL6LT9LAwCAb7r8q6a+g/GOSb8ZbKSW5FuAT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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