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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd855cee0b57703593a07a15bb399ee1b2c00eb706f36ab60eea515f7a9b782b3' 
  AND token = 'VLCBZLpP4R4iIe5tLbVQDbkaMvDDsM9LpUNlOTUeQkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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