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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab83d07cc0fea31d9e9a4cb7bf7f316cb8f7ada5de066e41b853088c91adc53' 
  AND token = 'IytWjYM+cMfCefhXPI0mCqM7llBY/WOHpznAvM+kUUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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