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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f69e17d95e4ad119ff1460f6ac1a928504d10ff50a9d2b31d8f344d120da97' 
  AND token = 'wAFcwlY4wGvPvV2ryKaq7FQZOUkZEKCSMl4M4M/6AXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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