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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8664ebf0e1359e56709d9df6700f93effa27de077f17c6ff1c90685f4838b8e2' 
  AND token = 'HK6H2aTRcS1fv9b19r8wUoBQ6hdXXGwIQal9ouhqO3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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