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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc0da4dac5bf2872c11428c90440f8ff2d90dcd201941aad913044e819c285b' 
  AND token = 'Jwmb0Vx7fwVCh05VMR/Z0G6uNtb8T7sVVUegKKfM7+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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