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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0298e9203b429c8d68c243969a9bd566a5c98e1df33205b39d9814c3dd342bc7' 
  AND token = 'j+xvRMpu1a2MOkCYk2AYUncAhdJajsz4FbsfRCxslRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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