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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d4b5c49679d4afd20c35c447ee7ed952a9b48b5fd864dc69f486245d9e6bfb' 
  AND token = 'pCahRnKXtqNyOro+fLQkYZFzl2OyufqdMkhoS8hhD3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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