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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df8973ae69b2451a2f826007c5c4e8db3968621ae25bdce43d1fc1a30a7ba35' 
  AND token = '/KvIWqHe1oQ2lC4YUNScWmfzGyj4O5wte5xnctupucM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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