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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc5c21734793b0f547f6f4b1b96c95e3be04ccb166bfc833b68ccbc5956f50e' 
  AND token = 'M2dpEbcNdTZIko0ZCS/qLSko0dqIQDJvPYI3J3w7DGU=' 
  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"
    }
  }
}