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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cee4d1179ba9fee5adae3d07195a715b011dbba0ee6fffa14a3c3bc48963a82' 
  AND token = 'TX43QIW0KXwnWnUF3flqpl1JwYxi+6ZXdsCFpTWCI4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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