SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc7f127fee476597ea609cc97c7e9076946defd2d2d041154ad05554a8630b1' 
  AND token = 'G/MdYs7PShgzQwO0dgyTF1+/KGvC4L8namC/vqrrpAs=' 
  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"
    }
  }
}