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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '278a12e79ad5b0558737ea5fb9d4be9f6dedebc55a4d8113d7765d19dfcd9e13' 
  AND token = '0Q/qQawOUENKracxzyh9Qnqy+XzNUlPGVzqI73gw6Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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