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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6961782cae77eb2943f4a172184841e2467acb9f466a0d71f83e34961fd9fe4b' 
  AND token = 'Yc6ZCX8qaPes33+F+AX6F6WS0PhWWl9sAiFFXCGE7JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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