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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cbb9c290ec69c1a41806ca298fbf3fc7728b241101c4b8b81ad2890772979a' 
  AND token = 'J3z8wA3VpxV4N2Lj7yu9PGFIwb3ZE6I3cjIVaEOuFZk=' 
  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"
    }
  }
}