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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71c800d9468de2f87fd02cfa9ffeb15b1ac5e7eb7e71925c25a213c1274f63c' 
  AND token = 'OYARYo5eyv5opsIaR5rUJwKcjtWHWx1HDK2gcAbSVCQ=' 
  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"
    }
  }
}