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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71183a67dedcd743017d553d970150ec76b6d4d15a721ec166203b7a87e166e7' 
  AND token = 'HUO314J0hejx8t8hkDbeBI3lV6OpB9EiKA3kwxac8vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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