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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a182c333d01539d4c532253c64e1993238c560e298d205a55887827dbe3abcb' 
  AND token = 'QCkrJWkUspQ+x+M/K/+OeNX9fBFB3vPgyV71bKesC6Y=' 
  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"
    }
  }
}