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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c44399ddb34ecd2915fc850a87370c751b3533effde3c3f015ef355ff8ab3e' 
  AND token = 's0k8QAmCo2qdPYMXIDYCqH3ylJCpU5F+FsjWLLksbGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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