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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ab9bab7e1f1f57f8eb6885614438e52ded7e9685aa343a4db1c044dbb22040' 
  AND token = 'OCX4/oXeVcTdg7ToEZ6+WcmE/+YYB1ws5A5umga883w=' 
  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"
    }
  }
}