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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ce489a79f403605c7c82d085896035842c0c3d206ed6a3c5e81c4ab4c8ac16' 
  AND token = 'FQlIfTYfQKld7aT+CJyrf46KIi3rLz+h6wg3dUM4bKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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