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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c7d5b48f6c1a1d7a2556b73a8bbfe721dcc1caea737c8ebba299dd956e1ea9' 
  AND token = 'P/O6rONzrHNhh6qpzcE35hObbEBmro6WI41rpn9i02o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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