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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5c9e74af3bad8e8c751962e73a9f9d4c57e3978a569f8ae426d2288beab168' 
  AND token = 'X5wj36C9VN1T+JRKywaoK6fcCv0tXMsjlKHxSd70UBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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