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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05da6f3beec981676033f35b66d6d5aa84e2d0cd05fbb3cb928e835aca1b5deb' 
  AND token = 'HEO44xTtE/5I/yzOUF2H8qCI4nPLxrD8cu0Kwm/Nxmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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