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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d1a9db18020de498eec875ef360f37776cd949bf9f1fbc302a7445cfdf58f2' 
  AND token = 'D6BDZPl4jVv3n5IPmxIi61Y0R5Y91r2H6GffL/ZM3VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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