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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3da75a36d4923df52d3997eeaaf3469e67a4afc27a3877d47eb2ee3a18cdff' 
  AND token = 'sGIAHWt3NScJubeTq4AP91Wb2cqe2vggLXAL6se8ebw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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