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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578d52d7e3acd6151ecd7db5106cfbb83465463068b807ba9e7ae869261ba99d' 
  AND token = '1isktAYU1xM5w6gwL2y8bT3LA5nzZMWyXzqgFyigDWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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