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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d77f11abb795dfc51149aa05e357dd3578b6f70c091c254363ffaf1328c5a0c' 
  AND token = '6q85Spjj8+I9aAi4Y6R1Bfx43Q58k22DLNr+tgLZw7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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