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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe863e887b832a6e6ca4b70d5b6c9be752e2d44bc81de9611523a4162cd3154a' 
  AND token = 'yPOh3sKS7DdGpdEhmXtAK8NsWv2H93hOaSHM2KfsG/4=' 
  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"
    }
  }
}