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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a3de7df59defb43bfe2d4fbb4cdcbb9056ee91d6d65ae9f8725a4d58a52223' 
  AND token = '9q881QKqhTdHn26oRQI24NXzPlPhysObC5DpX+f0Owo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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