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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5566cbafd5f10357c2f3f4f8893e4f4e0bbbe9904235a2cefc56a51f7f5ea74e' 
  AND token = '8Z9lB2oWeZizIKAsi0cE6yP9JIAq7ZBKBc4YRRLZyVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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