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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8e4ab6ca5b08ce1b6b2cac492590962a8c2be1ab3a65a967bf9eb2c6377cee' 
  AND token = '2LqY8sIrUiqu5cT6HJ3p/rgaMHDYe6HKPuk02dqHUeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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