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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6773bb88ddceebcebd2e563bc270ed1327a9e50b8f2bf23b0fd617715f1836' 
  AND token = 'Oty6Sb0gi9ZuWfM6A03/gv++NcFmlqr7il6PK+vZxOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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