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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d66282726ebea74aa398bed7afd76a01230e7b5cade592ce99fd4b31b0ba9c' 
  AND token = 'XR3p88BCO82i7zEiGoPwHNH6SO8XuigpX+Q8DRkvHBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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