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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b6ad9cdb1632eb848732cf9b4995df861b01edb54be802305544aca76410c2' 
  AND token = '9UNPoWxOEORsnIiPUKwm3G+ynS26rBxS+leEPyOG1ic=' 
  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"
    }
  }
}