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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd193600d0fbff0a81c6454c78ed3856bad266fa497517645d94b94158a3e6e11' 
  AND token = 'Nbk5eKtAXkO1tYeOK1zz1iuk157fC13pznHMsTUu1xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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