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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e037ff348674b1a0a8288f6556af02383e16e3512b3cbd6efbb37f9e30a018' 
  AND token = 'UbwfopInmr0kD+Tn0RXDatl3UKnoRb4vSQ21i1pSEms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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