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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16086f9f3972e48bd65a69b48969d859b3d2ea9fcab438808e91c93fcb94422' 
  AND token = 'hi3/atQfGI0y5nutDq7NwfWD/dq8CQ/eQZVwrLSjFrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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