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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc701bf9ddd773c088a289070a659cfb9455dcc9dca5d72c6f04bb73b0baf4b3' 
  AND token = 'pZbmYKIk/Hu44hrVtA5EX8180rqJpjLbk1rPuILuru4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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