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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf09e5752b8059411bbedb5563d78611cabff505d3e9236d49004c7ef4cf717' 
  AND token = '0cmCevbU/WAXjfmbK/8QXwduYBAV7kKF1Xy5xtCAMgY=' 
  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"
    }
  }
}