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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196cf5f82537bf763f745ab5831a4e286e35c2c7a5cfda172ad41dd6c2f63317' 
  AND token = 'LGD4Nt7U1l7aq4QgvMueC1CAEN6VV7Qh2HvVPSdk8pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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