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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de528f119d6ff9a19e835f3dfd2185cdc9d120af25b8399ea0bc03cf8d336121' 
  AND token = '2JvIg+m/T91D+nM1A25Yq5wU37dA0IvVGswPsnOtiUI=' 
  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"
    }
  }
}