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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21cac940946b0eb88ba51cf28cffc013a8a5f9ef55a16c7a4303c13629f7fac9' 
  AND token = 'PkrYqE0XG6tACnztMqDYPjkBBJdXKRYiG/yIy9F25rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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