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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf8fe9ea5f17f35a8edb1d7b8872d8328c6f0a4aad89a045fecc51fd8b53edd' 
  AND token = 'APVT2YJ/P9tN6Pn6RQ49yUtZUh4pciA0igV6nAeNK1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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