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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63208bb4bcb36c754c174c93112db32e00a938d3b3a2dfe28fc6f78c634c21b5' 
  AND token = '6QYQTytP3jmSbSqtuoA++L+0vXHfbq/wNrMmLxrJwOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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