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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbb5c33ee02c439bbf178cc6ae496c102070a06533bf62c9e3592a845c5ab1f' 
  AND token = 'PIcB16NMAUw1GntAehPVq7DgHG10sobjkf/rYl1etiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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