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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a648d09f934594423913cb7ee4d82b0a77d25a98c61dcb954c83f9dca9bce6b' 
  AND token = '28Su+Xz+4B5YYRODV3VfIUX0Tv0vAlvfrpGwwFcaa+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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