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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0788c8b2f6608b347864514f9f8b55a4c24c94dd9e8eb3484b849686dd174187' 
  AND token = 'quE8j/D8SGXGtlTsHznqXAU5wc2rkgSYTXglFUNdtp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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