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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23daa96bf6b3592bddf2a2a39804a67b8a416c324e607fd2075507ecd4abf52e' 
  AND token = '/4k0ubp9aRCt+0nFruzKbdkFfgzYimTLrISBXZIDpo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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