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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea2d4ad615b4ac8e04604e832aa9f635852e140003ef2ee37dbe0215a48635a' 
  AND token = '69Frml9dIx5uzTzHZNXauN3x8N6nBnK9xIfctSL9Iy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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