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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5137a1e24b7669787b708acda8e9880e4f17592f4ab4c5431a4aeb9382145ba' 
  AND token = 'RLK1XXgvk8A8P0xiFzxL9Tu+p0PA7OIB2XraGCkzXp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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