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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c736c5e1d9bcccc6d872eb6773c742c9b504ae07cf05d45dc386fcd0ad600484' 
  AND token = 'QK8mP0yQAiE18db7c6h6RgM7Fn4qIuypNldnwQizh1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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