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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5962a765fc2d93dbadaee691b5c4c9d52410bc4e3c99a0f023748f30d1088e0d' 
  AND token = 'NY+RcJu2KuTQwn2ExfGaQwy74i60ICisJQ6zJ1K6ZdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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