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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8b5e20d7ad87d7f1662b210b32e9420e99ab0e8aa3f0f1e0e56dead47a7720' 
  AND token = '9+XcDV0VNbMA5LK8CKumAG4U/GzHC/RQbjT9xxarmT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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