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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b5da7a0fb5a7882568cf70f1ac7834bf7410a4e1c1269893aa4be4106ab0df' 
  AND token = 'Yngf1nMrDFdKJGWm8F2ga29nV7XVnZzpu3IKxCN7czc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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