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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0baf6689584e97745196da744bbe6b105c4ecda765bd4fdb2f9b2a365adc162d' 
  AND token = 'PIx6eAf74bbqP/zbFiH3UxfGIZyUs+0/WlkIBlk7vBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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