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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357cb6d11e150e6c32493b37867f5ede317d56c28a895ec2fd2b5c3d521b60c3' 
  AND token = 'cB3qkUISHtl4xccUVE6YM1b//LG54qDMjGt4Yu+HLMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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