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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d2808c1241b70c8578de3c1e9103764f84d5eae5d3c6520d473a606c1ebd8d' 
  AND token = 'Cj+ETHnYp5chh83RxZQAN7hV+b+KYgHYsBVRnB9vNCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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