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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2d6f87a8889a7afae6b2292d9b60a9a5d2541c6348c2dcde70ff107ae7be8e' 
  AND token = 'bSMyLC5IhJSKqCIR9AqpxpoEMnsiW0SXrVaq4qzrQcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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